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check_apt returning NRPE: Command 'check_yum' not defined

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check_apt returning NRPE: Command 'check_yum' not defined

Posted: Tue Oct 08, 2019 6:46 am
by pelicanmedia
I am getting the wrong response to the check_apt plugin on a new server, set up today.
I do not have check_yum anywhere related to this host, yet I am getting the wrong response.
If I run check_apt locally I get the correct response:

Code: Select all

user@web-backups:~# /usr/lib/nagios/plugins/check_apt
APT OK: 0 packages available for upgrade (0 critical updates). |available_upgrades=0;;;0 critical_updates=0;;;0
In the config file for the host I have:

Code: Select all

###############################################################################
###############################################################################
#
# HOST DEFINITION
#
###############################################################################
###############################################################################

# Define a host for the local machine

define host{
  use                     linux-server
  host_name               host.name
  alias                   Web Backups
  address                 xxx.xxx.xxx.xxx
  }

###############################################################################
###############################################################################
#
# SERVICE DEFINITIONS
#
###############################################################################
###############################################################################

define service{
  use                     local-service
  host_name               host.name
  service_description     Drive Space
  check_command           check_hdd!10!5
  }

define service{
  use                     generic-service
  host_name               host.name
  service_description     Updates
  check_command           check_apt
  }

define service{
  use                     generic-service
  host_name               host.name
  service_description     Uptime
  check_command           check_remote_uptime
  }
In the commands.cfg on the server I have:

Code: Select all

# 'check_yum'
define command{
        command_name    check_yum
        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c check_yum
        }

# 'check_apt'
define command{
        command_name    check_apt
        command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c check_apt
        }
In /etc/nagios/nrpe.cfg on the host I have:

Code: Select all

### SYSTEM UPDATES ###
#command[check_yum]=/usr/lib/nagios/plugins/check_yum
command[check_apt]=/usr/lib/nagios/plugins/check_apt
If I change /etc/nagios/nrpe.cfg on the host to:

Code: Select all

### SYSTEM UPDATES ###
#command[check_yum]=/usr/lib/nagios/plugins/check_yum
command[check_yum]=/usr/lib/nagios/plugins/check_apt
I get the correct response.... :? :?

Any ideas?
Thanks

Re: check_apt returning NRPE: Command 'check_yum' not define

Posted: Tue Oct 08, 2019 7:42 am
by pelicanmedia
Figured it out. Badly written software...

My new host's host_name was web-backups.host.name running Ubuntu.
I had another host called monitor.host.name running CentOS plus another call just host.name, also on CentOS.

It appears Nagios ignores anything before host.name so the results I was being shown for monitor.host.name were actually the results from host.name. I only noticed this when searching for files containing 'check_yum' and noticing the below results:

Code: Select all

[1570533035] Warning: Duplicate definition found for service 'Uptime' on host 'monitor.host.name' (config file '/usr/local/nagios/etc/config/web-website.cfg', starting on line 40)
[1570533035] Warning: Duplicate definition found for service 'Updates' on host 'monitor.host.name' (config file '/usr/local/nagios/etc/config/web-website.cfg', starting on line 33)
[1570533035] Warning: Duplicate definition found for service 'Drive Space' on host 'monitor.host.name' (config file '/usr/local/nagios/etc/config/web-website.cfg', starting on line 26)
[1570533035] Warning: Duplicate definition found for service 'Uptime' on host 'web-backups.host.name' (config file '/usr/local/nagios/etc/config/web-backups.cfg', starting on line 40)
[1570533035] Warning: Duplicate definition found for service 'Updates' on host 'web-backups.host.name' (config file '/usr/local/nagios/etc/config/web-backups.cfg', starting on line 33)
[1570533035] Warning: Duplicate definition found for service 'Drive Space' on host 'web-backups.host.name' (config file '/usr/local/nagios/etc/config/web-backups.cfg', starting on line 26)
I have now changed the host_name's to 'web-backups' and 'monitor' (excluding .host.name) and everything is now working. Pretty poor if you cant use the FQDN for the host as the host_name in the config file for that host.

Re: check_apt returning NRPE: Command 'check_yum' not define

Posted: Tue Oct 08, 2019 7:47 am
by scottwilkerson
pelicanmedia wrote:I have now changed the host_name's to 'web-backups' and 'monitor' (excluding .host.name) and everything is now working. Pretty poor if you cant use the FQDN for the host as the host_name in the config file for that host.
It looks like you had some duplicate definitions whereas Nagios is just going to pick one of them.

Re: check_apt returning NRPE: Command 'check_yum' not define

Posted: Tue Oct 08, 2019 8:14 am
by pelicanmedia
When I change the host_names back to monitor.host.name and web-backups.host.name I get the warning back in /usr/local/nagios/var/nagios.log.

Code: Select all

[1570539439] Warning: Duplicate definition found for service 'Uptime' on host 'monitor.host.name' (config file '/usr/local/nagios/etc/config/web-website.cfg', starting on line 40)
[1570539439] Warning: Duplicate definition found for service 'Updates' on host 'monitor.host.name' (config file '/usr/local/nagios/etc/config/web-website.cfg', starting on line 33)
[1570539439] Warning: Duplicate definition found for service 'Drive Space' on host 'monitor.host.name' (config file '/usr/local/nagios/etc/config/web-website.cfg', starting on line 26)
[1570539439] Warning: Duplicate definition found for service 'Uptime' on host 'web-backups.host.name' (config file '/usr/local/nagios/etc/config/web-backups.cfg', starting on line 40)
[1570539439] Warning: Duplicate definition found for service 'Updates' on host 'web-backups.host.name' (config file '/usr/local/nagios/etc/config/web-backups.cfg', starting on line 33)
[1570539439] Warning: Duplicate definition found for service 'Drive Space' on host 'web-backups.host.name' (config file '/usr/local/nagios/etc/config/web-backups.cfg', starting on line 26)
web-website.cfg

Code: Select all

###############################################################################
###############################################################################
#
# HOST DEFINITION
#
###############################################################################
###############################################################################

# Define a host for the local machine

define host{
  use                     linux-server
  host_name               host.name
  alias                   Website - Ltd
  address                 xxx.xxx.126.241
  }

###############################################################################
###############################################################################
#
# SERVICE DEFINITIONS
#
###############################################################################
###############################################################################

define service{
  use                     local-service
  host_name               host.name
  service_description     Drive Space
  check_command           check_hdd!10!5
  }

define service{
  use                     generic-service
  host_name               host.name
  service_description     Updates
  check_command           check_yum
  }

define service{
  use                     generic-service
  host_name               host.name
  service_description     Uptime
  check_command           check_remote_uptime
  }
web-monitor.cfg

Code: Select all

###############################################################################
###############################################################################
#
# HOST DEFINITION
#
###############################################################################
###############################################################################

# Define a host for the local machine

define host{
  use                     linux-server
  host_name               monitor.host.name
  alias                   Monitor
  address                 xxx.xxx.84.95
  }

###############################################################################
###############################################################################
#
# SERVICE DEFINITIONS
#
###############################################################################
###############################################################################

define service{
  use                     local-service
  host_name               monitor.host.name
  service_description     Drive Space
  check_command           check_hdd!10!5
  }

define service{
  use                     generic-service
  host_name               monitor.host.name
  service_description     Updates
  check_command           check_yum
  }

define service{
  use                     generic-service
  host_name               monitor.host.name
  service_description     Uptime
  check_command           check_remote_uptime
  }
web-backups.cfg

Code: Select all

###############################################################################
###############################################################################
#
# HOST DEFINITION
#
###############################################################################
###############################################################################

# Define a host for the local machine

define host{
  use                     linux-server
  host_name               web-backups.host.name
  alias                   Web Backups
  address                 xxx.xxx.60.110
  }

###############################################################################
###############################################################################
#
# SERVICE DEFINITIONS
#
###############################################################################
###############################################################################

define service{
  use                     local-service
  host_name               web-backups.host.name
  service_description     Drive Space
  check_command           check_hdd!10!5
  }

define service{
  use                     generic-service
  host_name               web-backups.host.name
  service_description     Updates
  check_command           check_apt
  }

define service{
  use                     generic-service
  host_name               web-backups.host.name
  service_description     Uptime
  check_command           check_remote_uptime
  }
As you can see there is no reference to monitor.host.name in web-website.cfg. So no duplicate definitions as they all have different host_names.

Re: check_apt returning NRPE: Command 'check_yum' not define

Posted: Tue Oct 08, 2019 8:30 am
by scottwilkerson
Can you look in other files in your config directory

Code: Select all

grep -R monitor.host.name /usr/local/nagios/etc/

Re: check_apt returning NRPE: Command 'check_yum' not define

Posted: Tue Oct 08, 2019 8:41 am
by pelicanmedia
Sure...

Code: Select all

[user@centos ~]# grep -R monitor.host.name /usr/local/nagios/etc/
/usr/local/nagios/etc/config/web-monitor.cfg:  host_name               monitor.host.name
/usr/local/nagios/etc/config/web-monitor.cfg:  host_name               monitor.host.name
/usr/local/nagios/etc/config/web-monitor.cfg:  host_name               monitor.host.name
/usr/local/nagios/etc/config/web-monitor.cfg:  host_name               monitor.host.name
[user@centos ~]#
And just to confirm...

Code: Select all

[user@centos ~]# grep -R web-backups.host.name /usr/local/nagios/etc/
/usr/local/nagios/etc/config/web-backups.cfg:  host_name               web-backups.host.name
/usr/local/nagios/etc/config/web-backups.cfg:  host_name               web-backups.host.name
/usr/local/nagios/etc/config/web-backups.cfg:  host_name               web-backups.host.name
/usr/local/nagios/etc/config/web-backups.cfg:  host_name               web-backups.host.name
[user@centos ~]#

Code: Select all

[user@centos ~]# grep -R host.name /usr/local/nagios/etc/
/usr/local/nagios/etc/config/web-backups.cfg:  host_name               web-backups.host.name
/usr/local/nagios/etc/config/web-backups.cfg:  host_name               web-backups.host.name
/usr/local/nagios/etc/config/web-backups.cfg:  host_name               web-backups.host.name
/usr/local/nagios/etc/config/web-backups.cfg:  host_name               web-backups.host.name
/usr/local/nagios/etc/config/contacts.cfg:	email 				[email protected]
/usr/local/nagios/etc/config/web-website.cfg:  host_name                       host.name
/usr/local/nagios/etc/config/web-website.cfg:  host_name                       host.name
/usr/local/nagios/etc/config/web-website.cfg:  host_name                       host.name
/usr/local/nagios/etc/config/web-website.cfg:  host_name                       host.name
/usr/local/nagios/etc/config/web-monitor.cfg:  host_name               monitor.host.name
/usr/local/nagios/etc/config/web-monitor.cfg:  host_name               monitor.host.name
/usr/local/nagios/etc/config/web-monitor.cfg:  host_name               monitor.host.name
/usr/local/nagios/etc/config/web-monitor.cfg:  host_name               monitor.host.name
[user@centos ~]#

Re: check_apt returning NRPE: Command 'check_yum' not define

Posted: Tue Oct 08, 2019 8:59 am
by scottwilkerson
This is very strange, I places the 3 files from this post in my server
https://support.nagios.com/forum/viewto ... 18#p294257

and the verify config doesn't have any duplicate definitions.

You don't by chance have a hostgroup attached to the linux-server template do you?

Re: check_apt returning NRPE: Command 'check_yum' not define

Posted: Tue Oct 08, 2019 9:25 am
by pelicanmedia
I have one host group:

Code: Select all

define hostgroup{
        hostgroup_name           Servers - Linux
        members                  centos,host.name,monitor.host.name,web-backups.host.name, (plus a few other non related servers)
        }
The only other references to linux-server are in the default /config/templates.cfg and /objects/templates.cfg files.

It does seem to relate to the prefix to .host.name. As when I remove it from web-monitor.cfg, web-backups.cfg and the host group file everything works as it should.

Re: check_apt returning NRPE: Command 'check_yum' not define

Posted: Tue Oct 08, 2019 9:31 am
by scottwilkerson
My guess would be that the linux-server template contained an addition of the hostgroup "Servers - Linux" and this would create a new service for every member of the hostgroup.

Glad to hear everything is working as it should.

Re: check_apt returning NRPE: Command 'check_yum' not define

Posted: Wed Oct 09, 2019 1:43 am
by pelicanmedia
This has not been resolved as there is obviously a bug/flaw where it ignores the host_name field in the .cfg files.

The only 'fix' that I can get to work is by removing .host.name from the host_name field. I should be able to use the full name of 'web-backups.host.name' and 'monitor.host.name' without the 2 configuration files clashing and giving me false reading and/or errors.
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